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Also known as: uridine diphosphate 4-epimerase.
Lactose is a sugar (made up of glucose and galactose) which is broken down by an enzyme called lactase. Galactose requires additional enzymes to break it down-one of which is uridine diphosphate 4- epimerase. When this enzyme is deficit/absent (a rare genetic disorder from a recessive form of inheritance), it causes a disease called galactosemia.
The Epimerase test is a blood test conducted in infants to look for a uridine diphosphate galactose 4-epimerase deficiency (GALE).
A routine blood draw is required in order to perform the epimerase test. The blood sample is then taken to a laboratory for testing and analysis.
Reviewed by: Jack Wolfsdorf, MD, FAAP
This page was last updated on: January 18, 2022 07:20 PM